Implementing Wordpress landing page in front of opencart store

Hello, i have a couple of stores running on opencart. i want to implement a wordpress landing page in the root domain and set the store in the /store/ subfolder. The stores are ranking well for several keywords. would you reckon that doing this will drop my serp? will resubmitting for indexing with the 2 new sitemaps keep results without variations?
thanks in advance for your suggestions

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